Agent of Treachery

• WWizards of the Coast2019-07-12
  Official Ruling
  Agent of Treachery's effect lasts indefinitely. It doesn't wear off during the cleanup step, and it doesn't expire if Agent of Treachery leaves the battlefield. In a multiplayer game, it does expire if you leave the game.
• WWizards of the Coast2019-07-12
  Official Ruling
  If you don't control three permanents you don't own as your end step begins, Agent of Treachery's last ability doesn't trigger. If you no longer control three permanents you don't own as it resolves, you won't draw three cards. Those don't have to be the same three permanents each time.
• WWizards of the Coast2019-07-12
  Official Ruling
  If you gain control of a permanent "until end of turn," that effect will wear off during the cleanup step, after the end step. You'll control that permanent while considering Agent of Treachery's last ability.
• WWizards of the Coast2019-07-12
  Official Ruling
  Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it. Gaining control of an Aura or Equipment doesn't change what it's currently attached to.
• WWizards of the Coast2019-07-12
  Official Ruling
  A token's owner is the player who created it.

Rulings via Scryfall

• WO
  Wizards of the Coast2020-07-13

  Agent of Treachery was banned in historic on July 13, 2020. Because we feel the data shows a positive impact from the current suspensions, and because it is unlikely to be safe to reintroduce these cards to Historic anytime soon, Agent of Treachery is banned in Historic. Source: https://magic.wizards.com/en/news/news/july-13-2020-banned-and-restricted-announcement-2020-07-13
• WO
  Wizards of the Coast2020-06-01

  Agent of Treachery was banned in historic on June 1, 2020. For similar reasons as in Standard, we're choosing to suspend Fires of Invention and Agent of Treachery in Historic. As we continue to watch Historic grow and monitor the evolution of the metagame, we will in the future reevaluate whether it's appropriate to unsuspend each of these cards or whether these suspensions will become bans. Source: https://magic.wizards.com/en/news/news/june-1-2020-banned-and-restricted-announcement
• WO
  Wizards of the Coast2020-06-01

  Agent of Treachery was banned in standard on June 1, 2020. Recently, archetypes using Lukka, Coppercoat Outcast or Winota, Joiner of Forces to put Agent of Treachery directly into play have become uniquely frustrating to play against and difficult to come back from. The effect of stealing any lands or key cards, when at a high play rate, reduces diversity in the metagame. Therefore, in order to allow for more comeback potential against Lukka and Winota decks, and to promote deck-building diversity in Standard, Agent of Treachery is banned. Source: https://magic.wizards.com/en/news/news/june-1-2020-banned-and-restricted-announcement
• WO
  Wizards of the Coast2026-02-09

  Agent of Treachery was unbanned in historic on February 9, 2026. Agent of Treachery was banned in large part due to its use alongside Winota, Joiner of Forces, who is no longer a problem both due to the format's evolution and a rebalance. Source: https://magic.wizards.com/en/news/announcements/banned-and-restricted-february-9-2026